Results 21 to 30 of about 71,946 (109)

Chemical tracers in proto-brown dwarfs: CO, ortho-H$_{2}$CO, para-H$_{2}$CO, HCO$^{+}$, CS observations

open access: yes, 2018
We present a study of the CO isotopologues and the high-density tracers H$_{2}$CO, HCO$^{+}$, and CS in Class 0/I proto-brown dwarfs (proto-BDs). We have used the IRAM 30m telescope to observe the $^{12}$CO (2-1), $^{13}$CO (2-1), C$^{18}$O (2-1), C$^{17}
Caselli, P., Riaz, B., Thi, W. F.
core   +1 more source

A Search for Pulsation in Very Low-mass Stars and Brown Dwarfs [PDF]

open access: yes, 2007
Brown dwarfs and very low-mass stars constitute a crucial link between the intertwined processes of star formation and planet formation. To date, however, observational methods to uncover their formation mechanism or determine important properties such ...
Ann Marie Cody   +4 more
core   +1 more source

Primeval very low-mass stars and brown dwarfs - VI. Population properties of metal-poor degenerate brown dwarfs [PDF]

open access: yes, 2019
© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.We presented 15 new T dwarfs that were selected from UKIRT Infrared Deep Sky Survey, Visible and Infrared Survey Telescope for Astronomy, and Wide ...
Allard, F.   +6 more
core   +5 more sources

A homogeneous analysis of disks around brown dwarfs

open access: yes, 2015
We re-analyzed the Herschel/PACS data of a sample of 55 brown dwarfs (BDs) and very low mass stars with spectral types ranging from M5.5 to L0. We investigated the dependence of disk structure on the mass of the central object in the substellar regime ...
Bayo, A.   +4 more
core   +1 more source

Heptagons from the Steinmann Cluster Bootstrap [PDF]

open access: yes, 2017
We reformulate the heptagon cluster bootstrap to take advantage of the Steinmann relations, which require certain double discontinuities of any amplitude to vanish.
Dixon, Lance J.   +5 more
core   +2 more sources

The stellar and sub-stellar IMF of simple and composite populations

open access: yes, 2012
The current knowledge on the stellar IMF is documented. It appears to become top-heavy when the star-formation rate density surpasses about 0.1Msun/(yr pc^3) on a pc scale and it may become increasingly bottom-heavy with increasing metallicity and in ...
A Duquennoy   +344 more
core   +1 more source

Sudden change of quantum discord for a system of two qubits

open access: yes, 2013
It is known that quantum discord might experience a sudden transition in its dynamics when calculated for certain Bell-diagonal states (BDS) that are in interaction with their surroundings. We examine this phenomenon known as the sudden change of quantum
Fanchini, Felipe F.   +2 more
core   +1 more source

Causes and success of brand deletions. The role of brand orientation [PDF]

open access: yes, 2017
La eliminación de una marca es una decisión crítica dentro de la estrategia de marketing de una empresa. Pese a que en los últimos años muchas organizaciones han tomado este tipo de decisión y han acometido drásticos programas de eliminación de marcas ...
Rodríguez Escudero, Ana Isabel   +3 more
core  

X-ray Emission near the Substellar Limit: The sigma Orionis and Taurus Star Forming Regions

open access: yes, 2002
We have carried out an extensive search for X-ray emission from young, very low-mass objects near and beyond the substellar limit, making use of archived ROSAT PSPC and HRI observations pointed at Brown Dwarfs and Brown Dwarf candidates in the young ...
B. Stelzer   +35 more
core   +1 more source

Tidal effects on brown dwarfs: Application to the eclipsing binary 2MASSJ05352184-0546085 - The anomalous temperature reversal in the context of tidal heating

open access: yes, 2010
2MASSJ05352184-0546085 (2M0535-05) is the only known eclipsing brown dwarf (BD) binary, and so may serve as an important benchmark for models of BD formation and evolution.
B. Jackson   +54 more
core   +1 more source

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